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US 6,462,535 B1Granted
Eddy current sensor with a modification coil for reducing extensive heating and a method for operating such an eddy current sensor
AssigneeJohannes Heidenhain GmbH
InventorMichael Schwabe
Life of this patent
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Abstract
An eddy current sensor including an arrangement for generating a first magenetic flux, which is essentially directed vertically with respect to a moved body, a detector coil for detecting an eddy field in the moved body and a second arrangement which generates a further adjustable magnetic flux, which is superimposed on the first magnetic flux to form a resultant magnetic flux.
Claims23
A method for operating an eddy current sensor, comprising:
- generating a first magnetic flux, which is essentially directed vertically with respect to a moved body,
- generating eddy currents in said moved body in response to said first magnetic flux, wherein said eddy currents generate an eddy field;
- inducing a voltage in a detector as a result of a change of said eddy field;
- superimposing a further adjustable magnetic flux on said first magnetic flux to form a resultant magnetic flux.
1 more element
An eddy current sensor, comprising:
- an arrangement for generating a first magnetic flux, which is essentially directed vertically with respect to a moved body;
- a detector coil for detecting an eddy field in said moved body;
- a second arrangement which generates a further adjustable magnetic flux, which is superimposed on said first magnetic flux to form a resultant magnetic flux .
Dependencies are inferred from the claim text.